Estudo preliminar do efeito da cura por carbonatação em geopolímeros

Beltrame, Neusa Aparecida Munhak; Medeiros-Junior, Ronaldo Alves de; Dias, Roberto Luiz; Witzke, Franky Bruno

Neusa Aparecida Munhak Beltrame

conceptualization

supervision

formal analysis

methodology

data curation

writing

Universidade Federal do Paraná - UFPR, Programa de Pós-Graduação em Engenharia Civil - PPEGC, Curitiba, PR, Brasil

https://orcid.org/0000-0001-7240-4344

Ronaldo Alves de Medeiros-Junior

conceptualization

supervision

formal analysis

methodology

data curation

writing

Universidade Federal do Paraná - UFPR, Centro de Estudos de Engenharia Civil - CESEC, Programa de Pós-Graduação em Engenharia Civil - PPGEC, Curitiba, PR, Brasil

https://orcid.org/0000-0003-4879-4869

Roberto Luiz Dias

conceptualization

methodology

writing

Universidade Federal do Paraná - UFPR, Programa de Pós-Graduação em Engenharia Civil - PPEGC, Curitiba, PR, Brasil

https://orcid.org/0009-0007-9898-1845

Franky Bruno Witzke

conceptualization

methodology

writing

Universidade Federal do Paraná - UFPR, Programa de Pós-Graduação em Engenharia Civil - PPEGC, Curitiba, PR, Brasil

https://orcid.org/0000-0002-8132-3797

Corresponding author: Neusa Aparecida Munhak Beltrame. E-mail: neusamunhakbeltrame@gmail.com

Conflict of interest: Nothing to declare.

Author contributions: NAMB and RAMJ: conceptualization, supervision, formal analysis, methodology, data curation and writing; RLD and FBV: conceptualization, methodology and writing.

Editors: Edna Possan, Guilherme Aris Parsekian.

Property	Fine	Coarse
Specific gravity (g/cm³)	2.64	2.90
Bulk density (g/cm³)	1.64	1.45
#200 sieve fineness (%)	0.63	1.00
Fineness module	2.01	2.64
Maximum size (mm)	4.75	9.50

Concrete	Step 1: preconditioning	Step 2: carbonation	Step 3: additional curing
GEO	4 h in mold (T = 50 ± 5) °C; 2 h out of the mold (T = 50 ± 5) °C; 18 h (T = 25 ± 5) ºC, (RH = 45 ± 5) %	6 h, 15 Psi ≈ 99% CO₂ (T = 25 ± 5) °C, ambient RH	27 days (T = 25 ± 5) °C, ambient RH
PC	6 h in mold (T = 25 ± 5) °C; 18 h (T = 25 ± 5) ºC, (RH = 50 ± 5) %	6 h, 15 Psi ≈ 99% CO₂ (T = 25 ± 5) °C, ambient RH	27 days (T = 25 ± 5) °C, (RH = 95 ± 5) %

Property	GEO-C		PC-C		Statistical analysis
Property	Average	%	Average	%	p-value	Significance level
Water loss (g) during step 1	9.00 ± 0.59	13.1	32.77 ± 4.18	32.9	4.64E-14	Significant
Mass increase (g) after 6 hours of carbonation, step 2	9.59 ± 1.01	0.85	22.7 ± 2.23	2.14	1.05E-10	Significant
Carbonation depth (mm)	10.1 ± 2.11	-	9.10 ± 1.54	-	0.074	Non-significant
Carbonated area (mm²)	2556.35 ± 283.94	45.40	2335.17 ± 182.08	41.50	0.319	Non-significant

Properties	Average (%)
Properties	GEO-N		GEO-C		PC-N		PC-C
Water absorption by immersion	11.09 ± 0.47		10.93 ± 0.43		7.33 ± 0.26		6.33 ± 0.05
Void index	22.86 ± 0.84		22.32 ± 0.67		16.75 ± 0.48		14.59 ± 0.20
Properties		Statistical analysis		p-value		Significance level
Properties		Comparative		p-value		Significance level
Water absorption by immersion		GEO-N - GEO-C		0.7001		Non-significant
		PC-N - PC-C		0.0030		Significant
		GEO-C - PC-C		5,20E-02		Significant
		GEO-N - PC-N		0.0002		Significant
Void index		GEO-N - GEO-C		0.4368		Non-significant
		PC-N - PC-C		0.0004		Significant
		GEO-C - PC-C		4,38E-02		Significant
		GEO-N - PC-N		0.0019		Significant

Age	Compressive strength (MPa)
Age	GEO-N	GEO-C	PC-N	PC-C
24 h	-	25.84 ± 0.66	-	13.25 ± 0.63
30 h	17.74 ± 1.37	26.93 ± 2.32	16.98 ± 0.73	15.50 ± 1.76
28 days	39.08 ± 3.84	26.89 ± 3.05	34.85 ± 2.75	26.44 ± 1.00
Properties	Specimens	Statistical analysis		Significance level
Properties	Specimens	Comparative	p-value	Significance level
Compressive strength	(N)	GEO-N-30 h - GEO-N-28 d	0.0008	Significant
		PC-N-30 h - PC-N-28 d	0.0004	Significant
		GEO-N-30 h - PC-N-30 h	0.4418	Non-significant
		GEO-N-28 d - PC-N-28 d	0.1960	Non-significant
	(C)	GEO-C-24 h - GEO-C-30 h	0.4787	Non-significant
		GEO-C-30 h - GEO-C-28 d	0.9876	Non-significant
		PC-C-24 h - PC-C-30 h	0.3647	Non-significant
		PC-C-30 h - PC-C-28 d	0.0047	Significant
		GEO-C-24 h - PC-C-24 h	7.35E-5	Significant
		GEO-C-30 h - PC-C-30 h	0.0068	Significant
		GEO-C-28 d - PC-C-28 d	0.8204	Non-significant
	(N) vs (C)	GEO-N-30 h - GEO-C-30 h	0.0040	Significant
		PC-N-30 h - PC-C-30 h	0.2948	Non-significant
		GEO-N-28 d - GEO-C-28 d	0.0126	Significant
		PC-N-28 d - PC-C-28 d	0.0075	Significant

\begin{array}{l} 2 (3 C a O \cdot S i O_{2}) + 3 C O_{2} + 3 H_{2} O \to 3 C a O \cdot 2 S i O_{2} \cdot 3 H_{2} O_{} + 3 C a C O_{3} \\ C_{3} S C - S - H C a r b o n a t e \end{array}

\begin{array}{l} 2 (2 C a O \cdot S i O_{2}) + C O_{2} + 3 H_{2} O \to 3 C a O \cdot 2 S i O_{2} \cdot 3 H_{2} O + C a C O_{3} \\ C_{2} S C - S - H C a r b o n a t e \end{array}

\begin{array}{l} 3 C a O \cdot A l_{2} O_{3} \cdot 3 C a S O_{4} \cdot 32 H_{2} O + 3 C O_{2} \to 3 C a C O_{3} + 3 C a S O_{4} \cdot 2 H_{2} O \\ E t t r i n g i t e C a r b o n a t e G y p s u m \end{array}

\begin{array}{l} A l_{2} O_{3} \cdot 2 S i O_{2} + 2 O H^{-} + 2 N a^{+} + H_{2} O \to 2 N a A l S i O_{4} \cdot H_{2} O \\ N - A - S - H \end{array}

[1] Corresponding author: Neusa Aparecida Munhak Beltrame. E-mail: neusamunhakbeltrame@gmail.com

Brasil

Brasil

Estudo preliminar do efeito da cura por carbonatação em geopolímeros

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